Acrylic sand hourglass, as you know is belong to acrylic sand timer hourglass.
The frame is all made of clear acrylic. Glass bulbs are inside of the frame.
The maximum time of this hourglass is 3 minutes.
As this is a 3 in 1 sand timer, so the time is usually 1, 2, 3 minutes.
The size is 6*2*7.5cm. It is 6cm length, 2cm width, 7.5cm tall.
The glass bulbs inside are hand blown.
And we use glass beads as the sand.
Almost all the sand timer manufacturers use glass beads.
Few clients will customize the sand material.